Ratlibun.] 256 [December 16, 



Moderately abundant in the cretaceous beds at Pt. Nova Cruz 

 and Sao Jose, Prov. of Pernambuco, Brazil. Respectfully dedicated 

 to Dr. McGrath of Pernambuco, to whom Prof. Hartt and his party 

 are indebted for many favors and valuable information regarding the 

 geology of the vicinity of Pernambuco. 



Family TELLINID.E. 



Tellina pernambucensis sp. nov. 



Shell small, compressed, elongate, with the length equal to about 

 one and one-half times the height. Outline longitudinally sub-ovate. 



The beaks are situated near the middle, and are minute, pointed 

 and scarcely elevated above the hinge. In front of the beaks the 

 hinge margin descends gradually, curving very slightly toward the 

 anterior margin, which is regularly rounded. Posterior to the beaks 

 the hinge is nearly straight and descends a little more rapidly than 

 in front. The posterior extremity is not quite so high as the ante- 

 rior, but is quite regularly rounded. The ventral margin curves 

 moderately and regularly. 



The valves are depressed-convex, being most prominent anteriorly 

 and just above the antero-posterior axis. The curvature of the shell 

 from the ventral margin to the beaks is very gradual, and increases 

 slightly in strength upward. The surface rises gradually from the 

 anterior margin, curves slightly for one-third the length or more, 

 and then generally descends very gradually to the posterior extrem- 

 ity, in a nearly straight slope. Hence the shell is usually very much 

 compressed posteriorly. Sometimes, however, it is not at all flat- 

 tened, but nearly equally convex throughout. The surface is marked 

 with very minute, regular, rounded, concentric raised lines, set closely 

 together. The impressions of the muscular markings have not re- 

 mained on the internal moulds. The imprints of the two minute 

 cardinal teeth are very distinct in one specimen. Length, 17 mm.; 

 height, 12 mm.; depth of each valve, about 2.5 mm. 



From the cretaceous beds at Pt. Nova Cruz and Sao Jose, Prov. 

 of Pernambuco, Brazil, where only a few specimens have been 

 found. 



